Can I keep running the equipment with this fault active?

Generally no. Faults on Appliance units are emitted when a sensor, safety, or control circuit is outside its operating envelope. Running through an active fault risks compressor, heater, or control-board damage. Diagnose and clear the fault first.

What part is most commonly replaced for Bosch Dishwasher Detergent Dispenser Wax Motor Replacement?

The most frequently replaced parts for Bosch Dishwasher Detergent Dispenser Wax Motor Replacement are listed in the Parts Reference section of this guide with OEM part numbers and typical price ranges. Check the table for direct replacements.

Is Bosch Dishwasher Detergent Dispenser Wax Motor Replacement a DIY repair or do I need a technician?

Sensor swaps, fan motor replacements, and condenser cleaning are typical DIY-level repairs. Anything involving refrigerant, gas, or high-voltage (>240V) work requires a licensed technician for both safety and code-compliance reasons.

Bosch Dishwasher Detergent Dispenser Wax Motor Replacement

Q: What does Bosch Dishwasher Detergent Dispenser Wax Motor Replacement mean?

Detergent stays in closed cup after cycle. Wax motor actuator fails and stops dispenser door from opening. Replace wax motor to restore release.

Q: How do I fix Bosch Dishwasher Detergent Dispenser Wax Motor Replacement?

Follow the step-by-step diagnosis below. The most likely fix is identified by checking power, sensor resistance, and control-board signals in order — using a multimeter and the part numbers documented in the parts reference table.

Bosch Dishwasher Detergent Dispenser Wax Motor Replacement — What This Part Does

The detergent dispenser wax motor is a small actuator mounted inside the Bosch dishwasher door that opens the soap cup door on command from the control board during the wash cycle. When the board energizes the wax motor, it heats and expands, releasing the latch so the spring-loaded dispenser door swings open and drops detergent into the tub.

The wax motor fails electrically (open circuit) or mechanically (jammed or worn actuator), which leaves the dispenser door latched shut. Detergent never releases, so dishes come out dirty even though the dishwasher otherwise runs normally. This is the most common cause of dispenser failure cited in Bosch repair guides.

Jump to Replacement Steps

Signs It Needs Replacing

Detergent remains in closed cup after cycle The dispenser door stays latched and soap is still dry in the cup when you open the door at the end of a wash.
Dishes not clean but dishwasher runs The dishwasher completes cycles without error codes, but dishes come out dirty because no detergent was released.
Dispenser door will not open manually or feels stuck When you press the release latch the door does not spring open, or it binds and resists movement.
Multimeter reads infinite/open on wax motor terminals Testing the wax motor actuator on Rx1 scale shows an open circuit instead of continuity, indicating a failed element inside.
Clicking or no sound from dispenser during cycle You hear no actuator click or movement sound at the time the dispenser should release, or the sound happens but the door does not open.
Cracked or damaged dispenser assembly housing The plastic housing around the dispenser cup is broken, hinges are worn, or mounting tabs are missing so the mechanism cannot latch or release properly.

How to Replace It

Unplug the dishwasher from the wall outlet or switch off the circuit breaker at the panel to disconnect all power.
Open the dishwasher door and locate the model and serial number plate (usually on the top edge of the door frame or inside the door panel) to confirm your exact part number for the dispenser wax motor or assembly.
Remove the screws securing the outer door panel (or inner door panel on some models) and carefully lift the panel free, supporting the door to avoid dropping hardware.
Locate the detergent dispenser assembly on the inside of the door, then disconnect the wire harness connector from the wax motor actuator and, if present, the rinse aid sensor connector.
Remove the retaining screws or release the locking tabs that secure the dispenser assembly to the door, then lift the old dispenser or wax motor out of the mounting bracket.
Position the new wax motor actuator or dispenser assembly into the bracket, align the mounting holes, and fasten with screws or snap the locking tabs until the unit is secure.
Reconnect the wire harness connector to the new wax motor (and rinse aid sensor if equipped), making sure each plug clicks fully into place.
Reinstall the door panel by aligning the edges and tabs, then drive in all retaining screws to secure the panel to the door frame.
Restore power at the breaker or plug, then run a short wash cycle and verify that the dispenser door opens and releases detergent at the correct time during the cycle.

The Part You Need

Part	Notes
Bosch dishwasher detergent dispenser wax motor actuator	Amazon \| Bosch part number 00166635 is one common replacement. Check your model and serial plate on the door frame to confirm the correct dispenser wax motor or full dispenser assembly for your unit.

If this part is failing you may also see one of these codes:

When to Call a Pro

If you are not comfortable removing the dishwasher door panel, working with wire connectors inside the door, or using a multimeter to test electrical components, call an appliance technician. A tech will verify that the wax motor is the root cause (not a wiring fault or control board issue), perform the correct continuity test on the actuator, and handle door disassembly and reassembly without damaging clips or harnesses. Professional diagnosis is also recommended if the dispenser still does not open after replacement, since that points to a board signal problem or mechanical obstruction deeper in the door.